A GPS for your car.
Most nudist beaches always seem to be located in that National Park, hidden cove or the far end of a very long beach and public transport doesn’t really put you close by. Which means you usually end up needing to drive to save your legs and time.
If you rent or hire a car they usually charge you 10-15 of the local currency per day. So you may consider purchasing your own for about the 100 mark and taking one with you.
If you’re considering international travel a quick search on ebay for the maps you will need will be available on a card that fits into the back of your machine for a reasonable cost.